Rotary engine



sheets-Sheet 1."

Patented June 9,1891.

N ww: .INI www WML. AS

(No Model.)

S. G. BROSIUS.

ROTARY ENGINE.

4 Sheets-Sheet 2.

(No Model.)

S. G. BROSIUS.

ROTARY ENGINE.

No. 453,613. Patented June 9,1891.

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4 Sheets-Sheet 3.

(No Model.)

S. G. BROSIUS.

ROTARY ENGINE.

No. 453.613A

Patented June 9,1891.

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(No Model.) 4 Sheets-Sheet 4.

S. G. BROSIUS.

ROTARY ENGINE.

No. 453,613. Patented June 9,1891.

i; ATTO/WV? 'raTns PATENT GFFICE.

SAMUEL GLENVILLE BROSIUS, OF SAVANNAH, GEORGIA.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 453,613, dated June 9,1891.

Application tiled March 28, 1891. Serial No. 386,872. (No model.)

T LZ-Z whom t may concern,.-

Be it known that l, SAMUEL GLENvILLn BROSIUS, of Savannah, in the countyof Chatham and State of Georgia, have invented a new and usefulImprovement in Rotary Engines, of which the following, taken inconnection with the accompanying drawings, is a specication.

The invention has the following objects:

1o first, to produce a rotary engine of the least possible friction;second, to produce a rotary engine having a steam-tight packing; third,

to construct an engine in such a manner that no part shall bind orcramp, and so that the pistons will be at rest with regard to therotating cylinder when under pressure, and to admit steam, so as toavoid binding the cylinder or pistons in any posit-ion and to avoid allcentrifugal and centripetal friction and any packing causing unduefriction; fourth, to admit steam simultaneously to the cylinder or*cylinders, so as to avoid all binding or cramping; fifth, to oseillateor rotate the pistons when the same are not under steampressure, thusavoiding friction which would be otherwise encountered; sixth, toconstruct the cam or cams which oscillate or rotate the pistons with theleast possible throw, so as to avoid jar, and also to construct said camor cams with periods of restand periods of throw; (during the periods ofthrow the pistons are balanced and oscillate or rotate, traveiin g withthe rotating cylinder, and d uring the periods of rest they propel andrevolve the rotating cylinder;) seventh, to construct the engine in sucha manner that the pistons after passing the abutments oscillate, therebyclosing the cylinders and acting as piston-abutments, and being at restwith said cylinders during the period they are traveling and rotatingwith said cylinders around the axes of said cylinders to the point ofthe exhaust, where oseillations of said pistons again occur to pass saidabutments, the said oscillations taking place during theA time they arenot under steam-pressure or after exhaust or when the steam is on bothsides of the piston, so that the pistons will be balanced; (while it hasbeen stated that the oscillations are not under 5o pressure, yet theymaybe, if found advisable;)

eighth, to journal the pistons so that the periods of oscillation andperiods of rest may be controlled by a cam or some mechanicalequivalent; ninth, to construct and connectthe pistons so that they willbe balanced against centrifugal force under oscillation; tenth, toconstruct the pistons with wings, which will balance each other againstcentrifugal force; eleventh, to propel the shaft by pressure on thepiston, said power being communicated directly through the cylinder tothe shaft, to which it is securely attached; twelfth, to obtain anabutment with curves so constructed to avoid the edges of theoscillating piston and reduce the waste-steam area to a minimum;thirteenth, to oscillate the pistons by levers operated by cams;fourteenth, to completely balance the end pressure on the pistons byplacing two pistons on one shaft; fifteenth, to balance the levers whichcontrol the oscillations of the pistons against centrifugal force;sixteenth, to connect the cylinders so that steam admitted into one mayreadily pass through to the other; seventeenth, to connect the cylindersso that the steam admitted into one passes to the other by suitablepassages, thus avoiding friction from end pressure; eighteenth, toobtain a simple and effective packing between the rotating cylinder andstationary disk; nineteenth, to obtain a perfectly-balanced engine inall its parts, which will not be jammed or cramped by steam-pressure,centrifugal or centripetal force, centrifugal packing, and do away withpacking around the hub and all sliding friction, or any friction causedby any other than ordinary packing, and to obtain a practical and simpleconstruction. These and other objects are accomplished by the enginehereinafter described.

My invention consists of certain broad and novel features ofconstruction hereinafter described, and particularlypointed out in theclaims.

In the accompanying drawings, which illustrate my invention, Figure l isan end elevation of the engine, showing the location of steam andexhaust chests. The cylinders, pistons, and abutments are shown inbroken lines. Fig. 2 is a cross-section of the engine on line A3 A3 ofFig. 1. Fig. 3 is a cross-section of the engine on line A4 Ai of Fig. 2.Fig. a is a cross-section of the engine on the line A5 A? of Fig. 2.Fig. 5 is an elevation IOO of the pistens. Fig. 6 is an end view of thepistons. Fig. 7 is an end view of the pistons, a cross-section beingtaken on line A7 A7 of Fig. 5. Figs. Sand 9 are respectively eud andside elevations of the cam-blocks. Figs. 10 and 11 are respectively endand side elevations of the lever. Fig. 12 is a side elevation, part incross-section, of .the cam. Fig. 13 is a cross-section of the cam on theline A6 A6 of Fig. 12. Fig. 14 is an end view of the journal-box. Fig.15 is a side elevation,part in cross-section, on the line AS A8 of Fig.14.

Figs. 16, 17, and 18 are respectively the plan,

side, and end elevations of the packing-strips in the piston-seats. Fig.19 is an end elevation, part in cross-section on the line B5 B5 of Fig.20. Fig. 2O is a cross-section on the line B4 B4 of Fig. 19. Fig. 2l isa cross-section on the line B8 B2 of Fig. 22, showing the abutment inposition on the head. Fig. 22 is an end elevation of the head, showingthe location of the abutment and the steam and exhaust ports.

Like letters of reference refer to like parts throughout the severalviews of the drawings.

Vithin an outer casing G, to which are attached the heads H H, securedto a baseplate W, there are arranged rotating cylinders C, with theirpistons A AB B. Said pistons by their crank-shafts are controlled by thecam or cams. Said cams may be attached to the outer casing G.

The cylinders C are attached to the shaft N and drive it, and areconstructed so as to have annular cavities C4, which are formed by ringsC7 C8 and disk C, and piston-seats C, with their ilanges h, whichcomplete the circles of the rings C7 C8, allowing complete ring-packin gto be used between tht` packingplate H4 of the casing-heads H H and saidrings C7 C2, as shown in Figs. 2, 3, 19, and 20. The shaftrN is mountedin journal-boxes K, whichma-y be attached to casing-heads H and H. Thesaid piston-seats C6 contain packingstrips P, which have projections p5in their backs, forming the recess p to receive and hold in position thesprings p4. The packing- Y'stripsV also'ha've the oblong hole 152lengthwise, i

through which the pins p2 pass. Said pins extend through the holes andengage the cylinder in such a manner as to hold said packing in placewhen the wings A2 are not in contact with them, as shown in Figs. 3 and16 to 20, inclusive. Said packing-strips are also beveled on the contactside, so as to allow the edges of the piston-wings A2 to push saidpacking-strips back in place should they protrude too far. The cylindersare connected by the steamways Y', having the channel Y, which is thepassage between the cavities C4 in the cylinders C, through which thesteam freely passes from one cylinder to the other, which thus equalizesthe pressure in bot-h cavities simultaneously and admits of the use ofone steam-port and one exhaustport for each cylinder. The pressure onthe outer ring C7 is neutralized bythe pressure on the inner ring CS,and the end pressure on the two disks C9 counteract each other in likemanner, as also does Vthe pressure on the 7o disks L of the pistons A Aon the opposite end of the pistoirshaft a, thereby perfectly balancingthe cylinder and all parts under pressure during its revolutions.

The cylinders C are provided with the piston-seat heads c, which areplaced centrally with the piston-seat C6 and contain the journal-boxesc2, in which the journals of the pis.- ton-shaft a oscillate. Theseheads may be integral with said cylinder; but it will facili- 8o tateconstruction and repairscto make them separate and securely attachedthereto.

The pistons A and-A are constructed with wings A2 and disk L. One pistonis attached to each end of the crank-shaft a, which has the crank c2.The wings A2 balance each other against centrifugal force and are cut tothe curves L2 L2, respectively, which correspond to the curves of theouter and inner periphery of-the rings C7 C8, respectively, of '9ocylinder C, as shown in Figs. 3, 5, 6, and 7.

The pistons are provided with packingrings P2 in disks L and thepacking-strips P4 in the ends of the wings A2. Said packing rings andstrips respectively pack the disk 2 L in the piston-seat C6 and the endsof the wings A2 against the packing-plate H4 of the casing-heads H H.

The pistons B B are identical in construction and operation to pistons AA. Piston- Ioo shaft b, with its crank-shaft b2, is also identical withpiston-shaft c and its crank d2.

The casing-headslfll-l are providedwith abutments I, which protrudeintorthe cavities' C4, and are packed against the rings C7 C8 and 105journal-box extends on each side of it to enable the engine to beshortened by such a distance as the journal-boxes extend within thecasing-heads H H. As a given length of journal is required for agiven-sized shaft, it

will be readily seen how this operates in makr 2o ing the engine morecompact. The said heads vH H are also provided with the pack-ingplatesH4. The faces of the said packingplates may be made to the curve formedby the tractriX, known as the Shields antifriction curve," or any othersuitable curve," to avoid unequal wear between them and thepacking-strips P4 in the wings A2 of the pistons. Said wear is caused bythe difference in circumferential travel of the inner and 13o outer endsof said packing-strips on packingplate H4. The same curve may be appliedto the disks C of cylinder C, where the packing-strips P in abutment l,Figs. 2l and 22,

The abutment I is so coni ro ders C.

are in contact with the said disks for the same reasons as abovedescribed. Said heads 1I Il are provided with the steam and exhaustports S and T.

Referring to Figs. 4, 12, and 13, the cam is shown as constructed withthe outer flange F and the inner flange F forming between them thecavities F2, in which the cam-block ftravels. This cani-block has thejournalbox f3, which receives the journals I)3 of the lever D, which hasthe journal-box cl2, which receives the crank a2 and the piston-shaft a.

It is evident that as the pistons rotate with the cylinders they mustnecessarily, by means of the crank-shaft a and lever D, as described,carry the camblocksf3 As these blocks travel in said cavities F2, itwill be seen that the distance of the canrblocks f from the center ofYsaid rotating cylinder C must be changed, said cams having periods ofrest rc3 003 and 5v5 and periods of throw :r2 at? and fr fc4, as shownin Fig. l2. The cam F F is constructed so as to have the least possiblethrow sufficient to oscillate the pistons. This is accomplished byplacing the said cam outside of the circle described by the pistonshafte, so as to obtain a throw comparatively small in proportion to thediameter of the cam, so as to avoid or modify jar. During the periods ofthrow er? .r2 and .ff-,4 x4 the pistons are balanced, as previouslydescribed, and oscillate or rotate so as to pass the abutment I andtravel with the rotating cylinders. During the period of rest r3 saidpistons pass the abntments I, and during the period of rest .frs theypropel and rotate the rotating cylin- Said cylinders C are securelyattached to shaft N. Shaft N is therefore driven by the pistons throughthe agency of the rotating cylinders. The oscillations or rotations ofthe pistons are controlled by said cams through the agency of the leverD and camblocks f. Said cam may be attached to the base-plate W or tothe outer casing G, as shown in Figs. 2 and i. The center lines Y Y andX X, respectively, of the abutments I and of the cam F F should notcoincide. The angle of difference between said center lines is such asto allow for the distance of lead or follow of the crank a2 past thecenter of the piston-shaft a, so as to have the center of rest @r3 insaid cam coincident with the center of the abutments I.

Referring to Figs. i and 8 to 11, inclusive, it will be seen that thelever D is constructed with the journals D3, which have a bearing in thejournal-boxes f3 of the cam-bloels f and the journal-boxes cl2, whichreceive the crank a2 of the piston-shaft a. The guides D4 work over theshaft N and hold the lever in proper position with respect to the cranka2 of the piston-shaft a and the cam-blocks f. The counter-balances D5on the lever D are placed so as to counterbalance the centrifugal forceof the end which is provided with the journals D3 and journal-box 07.2.Said lever is provided with gib-blocks (Z and dito facilitate placing inposition, as shown in Figs. 2, et, lO, and 11. The lever D is identicalin construction and operation with the lever D.

The operation is as follows: Referring to Fig'. 3, it will be seen thatpiston A, having The piston A in turn takes the position formerlyoccupied by piston B. Continuing the revolution, piston B, after passingthe abutment I, again oscillates, taking the position as shown at A1",and is acted on bysteam from port S. It is evident that the piston A hastaken the position as shown at B10, and the steam which has justpropelled it is ready to exhaust at port T. Piston A then oscillates totake its original position. Piston B also takes its original position,as shown. This constitutes a full stroke. The steam passes freely fromone cylinder into the other through the passages Y, thus admitting steamsimultaneously on the pistons A A and on B and B', respectively.essarily operate in the same mannen The steam and exhaust ports S3 T3,respectively, may be provided in the easing-heads II H, as shown in Fig.3, so as to make the engine The pistons A and B nec- IOC reversible, thesteam and exhaust ports S and T being closed. A suitable cnt-off of theusual kind may be used at the steam or exhaust ports, or both. Thesteam-chests S and the exhausts T may be located on heads II H', asshown in Fig. 1. The cut-offs in the steam-chests S and S may beoperated through the levers U U2, attached to rocker-shaft U, which ismounted in journal-boxes V. Said levers U U2 may be operated by theeccentric and eccentric-rod R and R', respectively. Vh ere anon-reversible engine is desired, one steamchest and one exhaustport aresuffi-V cient, the steam passing' from one cylinder to the other throughpassages Y in Y.

IVhile four pistons and two abutmen ts have been shown, I do notlimitmyself to this number, as any number 'may be used, with all theircorresponding parts; and, further, I do not confine myself to the exactconstruction shown, as the same may be varied without departing from thespirit of my invention.

IIaving thus ascertained and set forth the construction of my invention,what I claim IIO as new, and desire to secure by Letters Patent,

tons connected in pairs by a shaft, and rotating cylinders connected bypassages for the simultaneous, introduction of pressure into thecylinders, whereby the end pressure resulting in friction is avoided,substantially as set forth.

3. A rotary engine having oscillating pistons connected in pairs by ashaft, and rotating cylinders connected on their adjacent sides bypassages for the simultaneous admission of steam to balance against theend pressure, said cylinders being closed on the outer sides bystationary heads, substantially as set forth.

4. A rotary engine having oscillating pistons connected in pairs by ashaft, and rotating cylinders formed by inner and outer rings andadjacent disks, said cylinders being connected by steam-passages throughsaid disks and the open ends abutting against and being packed onstationary heads, substantially as set forth.

5. A rotary engine havingoscillating pistons connected in pairs by ashaft, and rotating cylinders formed by inner and outer rings andadjacent disks, said cylinders being connected by steam-passages throughsaid disks and the open ends abutting against and being packed onstationary heads, said cylinders being firmly attached to adriving-shaft, substantially as set forth.

6. A rotary engine having oscillating pistons connected in pairs by ashaft, and rotating cylinders formed byinner and outer rings andadjacent disks, said cylinders being connected by steam-passages throughsaid disks and the open ends abutting against and being packed onstationary heads, said cylinders being firmly attached to a drivingshaftand mounted in journal-boxes attached to said stationary heads,substantially as set forth.

7. A rotary engine having rotating cylinders provided with annularcavities, said cylvinders having seats for oscillating pistons connectedin pairs by a shaft, which revolve with the cylinders, said seats beingformed by the enlargement of said cylinders, substantially as set forth.

8. A rotary engine havingl rotating cylinders provided with annularcavities, said cylinders having seats for oscillating pistons connectedin pairs by a shaft, which revolve with the cylinders, said seats beingformed bythe enlargement of said cylinders and having heads providedwith journals to receive V'the shafts of the oscillating pistons,substantially as set forth.

9. Arotary engine having rotating cylinders provided with annularcavities, said cylinders having seats for oscillating pistons, whichrevolve with the cylinders, said seats being formed by the enlargementof said cylinders and having removable heads provided with journals toreceive the shafts of the oscillating pistons, substantially as setforth.

10. A rotary engine having cylinders formed by outer and inner rings,and adjacent disks forming between them annular cavities, said cylindershaving seats for oscillating pistons, which revolve with the cylinders,said seats being formed by the enlargement of said cylinders and havingheads provided with journals to receive the shafts of the pistons, saidheads being in the adjacent disks, substantially as set forth.

11. A rotary engine having stationary heads and packing-plates androtating cylinders provided with cavities, and pistonseats formed byenlargements thereof, said pistonseats having flanges on the open sideto complete the circles formed by the inner and outer peripheries ofsaid cavity, so as to allow the ring-packing to be used in packing saidcylinder against said head, substantially as set forth.

12. In a rotary engine having oscillating pistons connected in pairs bya shaft and stationary cylinder-heads, and rotating cylinders formingannular cavities open at outer sides, said cylinders being packedagainst said heads on the said open side, substantially as set forth.

13. In a rotary engine having stationary heads and rotating cylindersforming annular cavities open at outer sides, said heads havingprotruding annular packing-plates which are packed Within said cylinderson the open side, substantially as set forth.

14. In a rotary engine having rotating cylinders into which stationaryabutments extend, said cylinders having piston-seats to receiveoscillating pistons connected in pairs by a shaft, and said pistonshaving wings which are curved so as to pass by and be packed in passingsaid abutments, substantially as set forth.

15. In a rot-ary engine having rotating cyl-l inders into whichstationary abutments extend, said cylinders having piston-seats toreceive oscillating pistons connected -in pairs by a shaft, and saidpistons having wings which are curved so as to pass by said abutments,substantially as set forth.

16. A rotary engine having rotating cylin- `ders provided. with seatsfor oscillating plstons, said pistons constructed of a disk and curvedWings connected by a crank-shaft which oscillates them, substantially asset forth.

17. A rotary engine having rotating and oscillating pistons andcrank-shafts, respectively, and mounted in seats and journals providedfor them in said cylinders, said pistons lOO IIO

with diamotrically-opposed wings balancing` each other againstcentrifugal force during oscillation, substantially as set forth.

l). A rotary engine having oscillating pistons connected in pairs by ashaft and rotating cylinders into which extend stationary abutments,said pistons when under pressure being at rest with respect to androtating said cylinders, the pistons oscillating and passing saidabutment when not under pressure, thereby' avoiding all friction due tooscillation-of said pistons under pressure, substantially as described.

20. A rotary engine having oscillating pistons connected in pairs by ashaft and rotating cylinders, into which cylinders extend stationaryabutments having curved projections protruding in opposite directions toreduce the waste-steam area, said pistons in passing the abutments beingpacked and in oscillating clear the curved proj cctions, substantiallyas set forth.

21. A rotary engine having rotating cylinders provided with oscillatingpistons which are connected bya shaft, and stationary abutmentsprotruding therein and packed in said cylinders, said abutments attachedto stationary heads which are also the heads of the cylinders,substantially as set forth.

22. A rotary engine having rotatingI cylinders with seats to receiveoscillating pistons, said seats having packing-strips held in place bypins in oblong holes and adapted to pack said pistons, sul'rstantiallyas set forth.

23. A rotary engine having rotating cylinders and oscillating pistonsand packingstrips held in place by pins in oblong holes and projectionsfor holding springs in place, substantially as set forth.

24. A rotary engine having rotating cylinders and oscillatingpistonsconnected in pairs by a shaft and packing-strips held in place bypins in oblong holes, substantially as set forth.

25. A rotary engine having rotating cylinders and oscillating pistonsand packingstrips beveled on the contact sides, substantially as and forthe purpose set forth.

26. A rotary engine having rotating cylinders, oscillating j'ristonsconnected in pairs by a shaft, abutments mounted on stationaryheads, and a stationary cam which oscillates said pistons 'in passingsaid abutments, substantially as set forth.

27. A rotary engine having rotating cylinders, oscillating pistons,abutments mounted.

on stationary heads, and a stationary cam which oscillates said pistonsto pass said abut ments, said. cam having grooves running alternatelyconcentric and eccentric to control said pistons, whereby the pistonsare held stationary with regard to said cylinders and are oscillated topass said abutments, respectively, the pistons in oscillating andpassing said abutments rotating with the cylind er and being at restwith respect to said cylinder in propelling and rotating it,substantially as set forth.

2S. A rotary engine having rotatingl cylinders, oscillating pistons,abutments mounted on stationary heads, and a stationary cam locatedbetween said rotating cylinders, said cam controlling the movements ofthe oscillating pistons, substantially as set forth.

29. A rotary engine having rotating cylinders, oscillating pistons withltheir shafts and abutinents mounted on stationary heads, and

la stationary cam located between said rotating cylinders, said cambeing located beyond the circle described by said piston-shafts, therebyproducing a cam of large diameter and small throw, substantially for thepurpose set forth.

30. A rotary engine having rotating cylinders, oscillating pistons withtheir crankshafts and abutments mounted on stationary heads, astationary cam, and levers with their ends moving in said cam andoscillating and controlling said pistons through their crankshafts bymeans of said cam, by which they are operated, substantially as setforth.

3l. A rotary engine having rotating cylinders, oscillating pistons withtheir crankshafts, abutments mounted on stationary heads, a stationarycam, and levers with their ends moving in said cam and oscillating andcontrolling said pistons by their crank-shafts by means of said cams, bywhich they are operated, said levers being provided with guides whichpass around the main drivingshaft, on which they slide, thereby holdingsaid levers in position with regard to the cam travel and pistoncrank-shafts, substantially as set forth.

A rotary engine having rota-ting cylinders, oscillating pistons withtheir crankshafts, abntments mounted on stationary heads, a stationarycam, and levers with their ends moving in said cam and oscillating' andcontrolling said pistons by their crank-shafts by means of said cams, bywhich they are operated, said levers beingl provided with guides,substantially as set forth.

A rotary engine having rotating cylinders, oscillating pistons withtheir crankshafts, abutments mounted on stationary heads, a stationarycam, and levers with their IOO IIO

ends moving in said cam and oscillating and controlling said pistons bytheir crank-shafts by means of said cams, by which they are operated,said levers being provided with counter-balances to overcome centrifugalforce, substantially as set forth.

Si. A rotary engine having rotating cylinders, oscillating pistons withtheir crankshafts, abutments mounted on stationary heads, a stationarycam, and levers with their ends moving in said cani and oscillating andcontrolling said pistons by their crank-shafts by means of said cams, bywhich they are ope ated, said levers having cam-blocks moving in saidcams.

35. A rotary engine having rotating cylinders, oscillating pistons withtheir crankshafts, abutments mounted on stationary ders, oscillatingVpistons connected in pairs by a shaft, abutments mounted on stationaryheads providedwith steam and exhaust ports,

said cylinders being connected by passages which equalizesimultaneously*the pressure in each, for the purpose setV forth.

37. A rotary'engine having rotating cylinders securely attached to adriving-shaft, oscillatin g pistons connected in pairs by a shaft,abutinents mounted on stationary heads, said heads provided with journal-boXes which receive the said driving-shaft, said boxes eX-tending inward to enable the engine to be shortened, substantially asand for the purpose set forth.

38. A rotary engineY having rotating cylinders, oscillating pistons withthe crankshafts, abutments mounted on stationary heads, a stationarycam, and ilevers moving in said cam, by which they are operated, saidlevers being provided with' the gib-blocks d to facilitate placing inposition, substantially as set forth.

39. A rotary engine having rotating cylinders, oscillating pistons withthe crank-shafts, abutments mounted on stationary heads, a stationarycam, and levers movingin said cam, Vby which they are operated, saidlevers being provided with the gib-blocks d4 tovfacilit'ate placing inposition, substantially as set forth.

40. In a rotary engine having stationary heads, oscillating pistons, androtating cylinders forming annular cavitiesopen at outer sides, saidheads having annular packingplates which pack against said cylinders,the faces of said plates and end of pistonsin contact therewith beingmade to an anti-friction curve to avoid unequal Vwear between theaitthends and saidfaces, substantially set 4l. A rotary engine havingoscillating pistons, rotating cylinders provided withl annular cavities,and stationary abutments pro-v truding and being packed in saidcavities, the ends of said abutments and the faces of the annular diskof said rotatory cylinder being in contact therewith and forming anantifriction curve to avoid unequal wear between said ends and faces,substantially as set forth.

42. A rotary engine having rotating cylinders revolving within an outercasing, abutments, oscillating pistons connected in pairs by a shaft,and a stationary cam placed within and attached to the outer casing,said cam oscillatin g said pistons in passing the said abutments,substantially as set forth.

43. A rotaryV engine having rotating cylinders, oscillating pistons,abutments, and a stationary cam placed within and attached to the outercasing, said cani oscillating said pistons to pass said abutments andhaving grooves running alternately concentric and eccentric to controlsaid pistons, whereby the pistons are held stationary with regard tosaid cylinders and are oscillated, respectively, to pass said abutments,the pistons'in osciliating passing said abutments rotating with thecylinder and being at rest with respect to said cylinder in propellingand rotating it, substantially as set forth.

44. A rotary engine having rotating cylinders Vrevolving within an outercasing, abutmen'ts, oscillating pistons, and aY stationary cam placedwithin land attached to the outer casing, said cam oscillating saidpistons in passing the said abutn'ien'ts, substantially as set forth.

45. A rotary engine having rotating cylin` ders revolving within anouter casing, abut- -ments, oscillatingfpi-stens, and a stationary camplaced between the said cylinders and Within and attached to the outercasing, said cam oscillating said pistons in passing the saidabutinents, substantially as set forth.

YIn testimony whereof I, SAMUEL GLENVILLE BRosIUs, have signed my naineto thisfspecification, in the presence 0f `two subscribing witnesses, onthis 21st day of March, A. D'. 1891.

' SAMUELiGLEN-VILLE BROSIUS.

Witnesses:

Trios. J. STALEY, J. HENRY KAIsER.

